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. 2021 Feb 10;12:932. doi: 10.1038/s41467-021-21156-w

Fig. 4. Spectroscopic studies.

Fig. 4

a UV-Vis spectra of 1a, 2a, 3aa, A’, B’ and Cu(NCCH3)4PF6 in DCM (5 × 10−5 M) and reaction mixture in EtOH (1a, 0.5 M). b, Stern–Volmer quenching efficiency of 1a with A’ and B’ (5 × 10−5 M in DCM, λex = 344 nm).